Evaluation of Comfort Properties of Polyester Knitted Spacer Fabrics Finished with Water Repellent and Antimicrobial Agents

Bagherzadeh, R.,Montazer, M.,Latifi, M.,Sheikhzadeh, M.,Sattari, M. The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.4

In order to impart barrier properties against water and microorganisms on breathable three dimensional spacer fabrics as medical or technical textiles, fabric samples were treated with two water repellent agents and a quaternary ammonium salt namely cetyltrimethylammonium bromide (CTAB), using pad-dry-cure method. Two different water repellent agents based on hydrocarbon and acrylic copolymer were used. The water repellent property of samples was tested by Bundesmann and contact angle tests. Antimicrobial activity of samples was analyzed quantitatively according to AATCC 100. Simultaneous finishing of samples was done with 3% CTAB and 4% fluoroalkyl acrylic copolymer. To study the effect of various treatments on comfort related properties, air and water vapor permeability, water repellency and compression were measured. The results showed that the antimicrobial and water repellent spacer fabrics can be achieved applying selected material without significant changes on their comfort properties. Also a regression model was presented to predict the water vapour permeability of knitted spacer fabrics based on course density (CPC) changing.

Cu₂O nanocrystals with various morphology: Synthesis, characterization and catalytic properties

Bagherzadeh, Mojtaba,Mousavi, Narges-alsadat,Amini, Mojtaba,Gautam, Sanjeev,Singh, Jitendra Pal,Chae, Keun Hwa Elsevier 2017 Chinese chemical letters Vol.28 No.5

<P><B>Abstract</B></P> <P>Cu<SUB>2</SUB>O nanocubes, octahedra, spheres and truncated rhombic dodecahedral were prepared and their structural, morphological, and electronic properties were investigated by X-ray diffraction analysis, X-ray absorption near edge structure, scanning electron microscope and transmission electron microscope and X-ray absorption near edge structure. Cu<SUB>2</SUB>O nanocrystals were successfully employed to catalyze the 1,3-dipolar cycloaddition reaction for the synthesis of 1,4-disubstituted triazoles. Cu<SUB>2</SUB>O nanocubes and octahedral showed the superior catalytic performance in the cycloaddition reaction. These results reveal that crystal-plane engineering of oxide catalysts is a useful strategy for developing efficient catalysts for organic reaction.</P> <P><B>Graphical abstract</B></P> <P>Cu2O nanocubes, octahedra, spheres and truncated rhombic dodecahedral were successfully employed to catalyze the 1,3-dipolar cycloaddition reaction for the synthesis of 1,4-disubstituted triazoles.</P> <P>[DISPLAY OMISSION]</P>

Silver Nanoparticles and Silver Ions: Oxidative Stress Responses and Toxicity in Potato (Solanum tuberosum L) Grown in vitro

Mozafar Bagherzadeh Homaee,Ali Akbar Ehsanpour 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.6

Under in vitro conditions, we examined the effects of silver nanoparticles (AgNPs) and silver (Ag) ions on potato (Solanum tuberosum L.) in terms of silver accumulation, production of reactive oxygen species (ROS), oxidative stress responses, and antioxidative defense systems. At all concentrations (except at 2 mg・L-1), the amount of Ag in the shoots and roots of Ag ion-treated plantlets was significantly higher than in plantlets treated with AgNPs. In both treatments, total ROS and superoxide anions were increased at concentrations greater than 2 mg・L-1. Damage caused by oxidative stress, such as ion leakage and cell death, was significantly higher in plantlets treated with AgNPs than those treated with Ag ions. Significant increases in the activities of superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase (GR),were found in both AgNP-treated, and Ag ion-treated plantlets compared to the control. However, in AgNP-treated plantlets, GR activity was significantly decreased at 20 mg・L-1. A significant reduction in glutathione (GSH), ascorbate (ASA), and the ratios of GSH to oxidized glutathione (GSSG) and ASA to oxidized ascorbate (DHA)were observed in plantlets treated with both AgNPs and Ag ions at concentrations higher than 2 mg・L-1. Moreover, a greater decrease in GSH and ASA contents was seen in plantlets treated with AgNPs compared to those treated with Ag ions. The present study indicates that both AgNPs and Ag ion treatments impose oxidative stress on potato plantlets under in vitro conditions. Furthermore, based on plantlets’ responses to oxidative damage, the observed alteration in the activities of radical scavenging enzymes and the depletion of GSH and ASA, AgNPs seem to have higher toxicity than the equivalent mass of Ag ions.

Language Proficiency and Collocational Competence

S. Mohammad Bagherzadeh Hosseini,Is´haaq Akbarian 아시아영어교육학회 2007 The Journal of Asia TEFL Vol.4 No.4

Assessing Allelopathic Index for Estimating Allelopathic potential of Ajowan Extracts

Mostafa Hojatian Far,Ali Bagherzadeh 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.2

Allelopathy is a procedure in which secondary metabolites are produced by plants. Some plants may beneficially or antagonistically affect other plants through allelochemical compounds which may be released directly or indirectly from live or dead parts and cause allelopathic and phytotoxic effects. The aim of the present study was to investigate the allelopathic possibility of ajowan (Carum copticum) extracts in different concentrations on morphological indices (germination and growth) of wheat (Triticum sativum), barley (Hurdeum vulgare), corn (Zea maize S.C 704), and safflower (Carthamus tinctorius L.) seedlings as proceeding crops and to develop a comprehensive formula for measuring the negative and positive effects of allelochemicals on growth indices such as shoot and root length, as well as the germination percentage on donor plants. It was demonstrated that increasing concentrations of ajowan extracts significantly decreased the Allelopathic Index, percent of germination, and other growth related indices of all seedlings. Based on the proposed Allelopathic Index of experimental plants, it was revealed that ajowan has posed a higher risk to corn and barley especially at the early stages of the growing cycle, while safflower and wheat indicated more tolerance to growth inhibition effects of ajowan in rotational sequence.

Analytical Study of Flat Slab Collapse Mechanisms due to Overloading in a Cluster of Exterior Panels

Alireza Pachenari,Shahab Bagherzadeh 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1

Analytical equations found in the literature to give the ultimate load of folding, punching shear and local slab collapse mechanisms have been generally derived assuming a uniform load on all flat slab panels. Regarding that these formulas are not able to consider the impact of unbalanced bending moment due to partial loading, they cannot be applied to evaluate scenarios like overcrowding during operation and change of occupancy. This paper categorizes various collapse modes due to overloading in a cluster of exterior panels as well as presenting analytical equations for the ultimate loads using virtual work method and yield line theory. The study also introduces two novel local slab collapse patterns around interior columns located at the corner of overloaded area. Predicted ultimate loads indicate that flat slabs on a square column grid are expected to be more prone to punching shear and asymmetric local modes around the internal columns supporting two adjacent overburdened panels compared to other column locations.

A stochastic computational method based on goal-oriented error estimation for heterogeneous geological materials

Ghorashi, S.Sh.,Lahmer, T.,Bagherzadeh, A.S.,Zi, G.,Rabczuk, T. Elsevier 2017 Engineering geology Vol.225 No.-

<P><B>Abstract</B></P> <P>Computational modeling of geological materials is challenging. Firstly, they are heterogeneous with numerous uncertainties in the input parameters and secondly, the computational cost of modeling geological structures is time consuming due to the large and different length scales involved. In this article, we propose an efficient computational method for heterogeneous geological materials based on goal oriented error estimation and adaptive mesh refinement. Instead of estimating the error in a specific norm, the proposed novel error estimation approach which is called dual-weighted residual error estimation, approximates the error with respect to the quantity of interest. The dual-weighted residual error estimation is a dual-based scheme which requires an adjoint problem. The adjoint or dual problem is described by defining the quantity of interest in a functional form. Then by solving the primal and dual problems, errors in terms of the specified quantities are calculated. In many applications in engineering geology, the material is heterogeneous. In such cases, the material properties can be regarded as random fields. This variety of material properties leads to non-uniform distributions of the solution gradients, e.g. stresses. Therefore, it is vital to apply a reliable error estimation approach to be able to do efficiently the mesh-adaptivity procedure with regard to varying material parameters with pre-defined correlation lengths. Hence, the proposed error estimator is extended by accounting for a random field model to describe the material properties. Local estimated errors are exploited in order to accomplish the mesh adaptivity procedure. The goal-oriented mesh adaptivity controls the local errors in terms of the prescribed quantities. Both refinement and coarsening processes are applied to raise the efficiency. The performance of the proposed computational approach is demonstrated for several examples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel adaptive methods for geological materials </LI> <LI> The method accounts for random fields and heterogeneities. </LI> <LI> It is shown the method is computationally faster than other adaptive methods. </LI> </UL> </P>

Effect of Synthesis Mode and Ni Particle Size on Microstructural Aspects and Hardness Properties of Combustion-Synthesized NiTi

Arman Khobzi,Mandana Adeli,Ashkan Sabour‑Bagherzadeh,Ashkan Arab,Hooman Abedi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

NiTi intermetallic compound was fabricated via two modes of the combustion synthesis process, namely, thermal explosion(TE) and self-propagating synthesis (SHS). The effect of combustion synthesis mode as well as Ni particle size on themicrostructure and microhardness of the final products was investigated. The phases in the products were determined usingXRD technique, and microstructural investigations were performed using optical as well as SEM-EDS in order to make acomparison between microstructural evolutions in each mode, other conditions being constant. The analyses showed thatthe desired B2(NiTi) was successfully formed as the primary phase in all samples, and no unreacted Ni or Ti powders werepresent. The main secondary phase was NiTi2which was invariably present in all samples; however, the percentage as wellas the morphology of the detrimental NiTi2phase was found out to be controllable by the mode of combustion as well asNi particle size. A comparison between the two modes revealed that samples produced by TE showed coarse dendritesin the microstructure; they also presented higher average microhardness values. The SHS-synthesized samples exhibitedmicrostructures similar to those observed in heat-treated and homogenized NiTi obtained from methods such as vacuum arcremelting and vacuum induction melting, and contained finely dispersed NiTi2particles. It was shown that a decrease in Niparticle size presented a grain refining effect on NiTi2in both modes.

A Mathematical Model for Dynamic Thermal Behavior of Multilayer Clothing System Incorporated with Microencapsulated Phase Change Materials

Ali Safavi,Mohsen Gorji,Roohollah Bagherzadeh,SAEEDEH MAZINANI,Masoud Latifi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11

In this research, the thermoregulation behavior of layered arrangement of fabric containing microencapsulated phase change materials (mPCMs) is mathematically modeled based on a previously developed theoretical model of monolayer fabric—mPCMs. This work considers a thermal range for mPCMs instead of just a melting point. The skin temperature is calculated for a simulated situation when a person moves from 35 to 0 °C atmosphere. The results show that the location of layers containing mPCMs has the primary effect on skin temperature. This study defines the effectiveness intensity index (EII) and effectiveness time index (ETI) to describe the dynamic thermal behavior of fabric settings. The proposed model, which is also validated by experimental results, can be used to estimate the thermal behavior of clothing systems containing mPCMs and design protective clothing systems with proper dynamic thermal insulation for different climates. This study presents the model that can be useful for design the garment layers containing mPCMs. Due to considering the melting range instead of just melting point for mPCMs, it seems that this simple model can predict the thermal behavior of garments close to real condition.

Organic/inorganic nanohybrid of MgAl@CuFe2O4-polylysine for hazardous Cr(VI) and methyl orange uptake: Multivariate optimization and isotherm study

Hassan Alijani,Mostafa Hossein Beyki,Reyhaneh Kaveh,Mojtaba Bagherzadeh 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4

An efficient organic/inorganic magnetic nanohybrid of MgAl@CuFe2O4-polylysine was successfully synthesized and employed as a suitable adsorbent for removal Cr(VI) and methyl orange from water solution. The prepared nanohybrid was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, vibrating sample magnetometer and thermogravimetric analysis. The nanohybrid of MgAl@CuFe2O4-polylysine was employed to adsorb anionic species, i.e., Cr(VI) and methyl orange through electrostatic attraction, ligand exchange and ion exchange. Multivariate optimization with Box-Behnken design was used to evaluate effective parameters such as dosage of adsorbent, solution pH and contact time on adsorption and their interaction. Results showed that pH, contact time and adsorbent dosage are effective parameters for Cr(VI) adsorption; however, the pH of the solution is the sole effective parameter for methyl orange adsorption. Both analyte adsorptions are fast with adsorption times less than 15 min. Isotherm study revealed that the prepared nanohybrid is a highly efficient adsorbent for methyl orange and Cr(VI) with adsorption capacity of 693.6 and 281.8 mg g−1, respectively. Isotherm study showed that adsorption of both analytes well fitted with the Freundlich adsorption isotherm model, which indicated multilayer adsorption on the heterogeneous surface. The magnetic saturation for the prepared adsorbent was 12.64 emu g−1, which was adequate and suitable for magnetic separation of samples. The prepared adsorbent was regenerated using ethanol-aquaeous NaOH solution as it shows 90% removal efficiency after three cycles.